Siemens 6EP4231-7HB00-0AX0 SITOP BUF1200 buffer module. SITOP BUF1200 buffer module Buffer time 300 ms at 40 A Buffer t. depends on load current DC input 24 V. It belongs to Buffer module. Recorded manufacturer technical characteristics include Depth: 155 mm; Width: 70 mm; Height: 135 mm; Weight: 1.2 kg; Protection class: IP20; Rated output current: 40 A; Buffer time (at 40 A): 300 ms; DC input voltage range: 24 ... 30 V.